Fluid actuated clutch and brake mechanism



Oct. 3l, 1950 J. N.'wE|LAND FLUID ACTUATED 'CLUTCH AND BRAKE MECHANISM 5 SheetsvSheet Filed Aug. 13, 1947 INVENTOR. j .raf/N /vwma/v0 Oct. 3l, 1950 J. N. wElLAND 2,527,865

FLUID ACTUATED CLUTCH AND BRAKE MECHANIYSM Filed Aug. 13, 1947 5 sh'eets-sneet 2 Oct. 3l, 1950 J. N. wElLAND l 2,527,865

FLUID ACTUATED CLUTCH AND BRAKE macmrsu Filed Aug. 15, 1947 s sheets-sheet 5 INVENTOIL JOHN /V- WE/Z HNI? Patented Oct. 31, 1950 I UNITED STATES A.P.1 .Tl-:1\rr OFFICE FLUID ACTUATD CLUTCH AND BRAKE MECHANISM John N. Weiland, Cleveland, Ohio, assignor to The Cleveland Punch & Shear Works Co., Cleveland, Ohio, a corporation of Ohio Application August 13, 19477, Serial No. 768,386

` brake mechanism for machines of the type referred to above, which mechanism includes an assembly of shiftable unitary clutch and brake shoe means selectively shiftable to clutching action by iluid operated means and braking action by pretensioned spring means, the assembly being constructed to effect automatic braking action by the spring means with a force including the force of the pretensioned spring means and a fraction of the force of the centrifugal forces created by rotation of the clutch and brake shoe means.

Another obj ect of the invention is the provision of a fluid operated clutch and brake mechanism for machines of the type referred to above, which mechanism includes an assembly of shiftable unitary clutch and brake shoe means selectively shiftable to clutching action by fluid operated means and braking action by pretensioned spring means, the assembly including lever and eccentric members arranged to effect automatic braking action by the spring means `with a force including the force of the pretensionedspring means and a fraction of the centrifugal forces created by rotation of the clutch and brake shoe means.

A further object of the invention is the provision of a fluid operated clutch and brake mechanism for machines of the type referred to above, which mechanism includes an lassembly of shiftable unitary clutch and brake shoe means selectively shiftable to clutching action by fluid operated means land braking action by pretensioned spring means, the assembly including lever and and brake shoe means.

11 Claims. (Cl. 192-17) vIn addition, the invention has other marked,

f improvements and superiorities which radically ber shown in Fig. 7; and

distinguish it from presentlyknown structures. These improvements or superior characteristics embodying certain novel features of construction are clearlyV set forth in the appended claims; and a preferred form of embodiment of the invention in'hereinafter shown with reference to thefaccompanying drawings forming part of the speciiication. Y l In the drawings:

Fig. 1 isa transverse sectional view through a fluid operated clutch and brake mechanism constructed in accordance with the invention, the mechanism being shown attached to the driven member, and coupled with the fly-wheel, of a power driven machine such as a power press, the section being taken on line I-I of Fig. 2 of the drawings.

""Fig. 2 is a longitudinal cross-sectional view through the fluid operated clutch and brake mechanism shown in Fig. 1, the section being taken on line 2-'2 of Fig. 1.

. Fig. 3 is a side elevation of the clutch and brake sifoe member. Fig. 4 is a cross-sectional View through the clutch and brake shoe member, the section being taken on line 4 4 of Fig. 3.

q Fig. 5 is a side elevation of the lever member actuating the clutch and brake shoe member.

Fig. 6 is a plan view of the lever membershown in Fig. 5.

p Fig. 7 is a front elevation of the yeccentric member pivotally supporting the clutch and brake shoe member and rigidly coupled with the actuating lever member. Y

Fig. 8 is a side elevation of vFig. 9 is a side elevation of the supporting pin pivotally connecting the base member of the fluid operated shifting device with the eccentric member. l f

Referring now more in detail to the exemplified form of the invention shown in the drawings, reference numeral 2 denotes the crank shaft of a power driven machine, such as a power press, which shaft freely rotatably mounts in roller bearings 3 and 4 a fly-wheel 5 driven in any suitable manner. Fly-wheel 5 has laterally extended from its rim portion 6 a circumferential ange 1 with a smoothly finished peripheral surface,

the eccentric memilange I6 and is secured to frame Il of the powerv 'driven machine by bolts I 8.

The identically constructed clutch and brake shoe members I each have their angesland 'I4 lined with brake-lining I9, I 9. to insure the desired clutching and `braking action with flange lil "I and brake drum I5, respectively. ,n Each-,clutch i and brake shoe member is shiftably coupled with base member of clutch and brake mechanism A 9 by a short eccentric member 2I rotatably supportedj-inbearing sleeves 22 attached to ange I4 oflsllch. clutch and brake Ashoe memben :This eccentric member 2| is rotatably ,supported by va pin .23.extended through an eccentric bore 24 in member-21 and secured thereto by a` key 25,V

which pin is pivotally coupled withperiorated lear porticnscfa fork-shaped, extension 2l 011 base member 23; A rotation of the thus pivotally supported eccentric member. elects ,shifting ofthe clutch and brake shoe member to clutchingor .centric members 2 I.

as shown, provided with means adapted to partially counteract centrifugal forces tending to shift the clutch and brake shoe members I0 radially outwardly when the clutch and brake mechanism is rotating. These counteracting means embody counterweights 5I keyed to pins 23 by key members 52 for joint rotation with ec- Counterweights 5I are arranged and proportioned to only partially equalize the centrifugal forces acting on the clutch and brake shoe members when such clutch and brake mechanism is rotated to insure proper clutching action and avoid excessive braking action of clutch and brake shoe members i3.

The Ypresent clutchi-.and brake mechanism is particularly well suited for high speed punch presses in Whichily-wheels are rotating at more than 400 R. P. M., as the power necessary for quick and proper braking action is proportionate to the centrifugal force created by rotation of the mechanism,. so that relatively light springs maynreadilyibe used inthe pretensionedispring braking positions, and such a rotation of eccenj tric member-,.Zlhis effectedA byan actuating .lever member. 23 sleeved upon eccentric member 2l and keyed thereto by a key 2 9, The actuating lever 2 8yembodies oppositely extended lever arms 38 and v3l which are coupled with a fluid oper- .v

l .and .,i'rictional,...clutchingengagement of. their. lined-flanges J2. withthe peripheralsurface o f flangeffl Jon-ily-wheel. ...Suchlclutching engager.. ment-.transfers the rOtarymOVementof flyewheel .1

direction by.. fluid-,entering cylinder 35 through a passage .3.51m the bottoml wall of the cylinder. This passage is in openQmmunication with a bore 3l.. inishaft .2 and permits feeding-of fluid .Y

into cylinder 3.5 to. force piston BAoutWardly and therewith. inward movement of clutch .and brake shoe member ansel of fly-wheel 5.

The '.pretensioned spring assembly 33 effects shifting of., actuating lever `v23 ini anropposite direction when fluid pressure in cylinder .3,4isre leasedand the uidcontainedin said cylinder ;V

permitted to be dischargedl therefrom through.

passage 35 and bore 3lA in` any suitable manner. .1." Pretensioned spring assembly 33, pivoted to lever,-

I D into clutching contact ,ys/ith;

arm Stof levermember .2.8 by a pin 38, embodies an elongated compression spring 39 seated betweentwo washers ,40 and 4I, washer 43 abutting 1 a clevis 42 pivotally coupled by pin 38 with lever.. 65.

arm 3I. and Washer 4Iy abutting a block member 44 pivotally coupled with a fork-shaped'extension` `45 onbase member 2G by pin 46. A guiderod 41, threadedly engaged with clevis I2A and slidin a/ clock'wise levers. @fig membersloutyvardly sc .that their lined, flanges assemblyito.decreasethe counteracting yforces of the springs .ofthe spring assembly during shifting of the Vclutch Vand brake shoemembers from av braking ,.actionto a clutching action. y f

presswitha crankshaft.2,;flywheel `5, according to commonipracticeris continuously driven by a ,v mctor,..pulley .and ,belt arrangement ,(not shown) ,f Starting of the press is effected by feedingguidf.. into .cylinderisto 1 shift. piston. 34,and therewith rotateactuatinglever 2,8-in.antirclockwiseadirecv tion against. the forcey of..pretensioned Vspring as sembly 33, .`.The^pivots: for such-.movement off-j levers areA pins.23 pix/.oted to ,base .niember...211 4 rigidly-.secured to crankshaft.:2 by `akey member 53. Ehe movement. of levers 28 veectsg,inward shifting-.0L clutch f and .brake shoe ;Inemb e1s 0.

5' through-.clutch and brakeshoe .members I il.. lto

crankshaft .-2; byimeans "of .eccentricmembers I.. coupling-:the shoemembers `withthe base.-mem...

. :ber 23.-.. 'NJi/li'enlinv clutching position clutch and. brakeshoemembers: Iilfhave. their. lined flanges.- Ill disengagedfromzfrictional. contact with brake drumwlvand thepretensioned.spring assemblies v 33 havetheir-pretensioned compression'springs 39.11..-

additionally tensioned@-Disengagement -of thel L clutch-ing action-of--flanges-I2-withcilange Lisi automatically effected by release-of-the fluid from .cylinders-35. vSuchla.release-may be-induced in any customary manner-andpermits springs-Sain cooperation with the centrifugalforcescreated by rotatir-'ofclutchand--brake mechanism 3 with fly-wheeltofrotateiactuating levermembers 28 Y irection. ,Such movement/cfm irl-.ing or clutcnandV brake shoe I4 frictio'nallynd. Vwithgreat force engage brake drumfll and stop further rotation of base member Zland crankshaft .Zirconnected therewith.

'ablyextended through pin 46, guides .the pre-1.....

tensioned spring 39. This guiderod carries on its outer threaded end 3 nut members .5G which are adjusted to contact blcckmember 45.. When.,..` the brake lining I3 is worn and vshould be rev newed.

The clutch and brake mechanism is preferably,

scribedmay gccurse be used as a socalleoltvvo-4 l way frictiqntelutch adapted@ seletivelyeuple independently. rotatabledrivine and Ydriven mem-- Transmission, etc.

Having thus described lmy invention: What'I claimis: S l A l. In clutch and brake mechanism a'driving member including ya peripheral surface, a driven member, means affording a stationary braking surface, vunitary clutch -and brake shoe means arranged -to selectively' cooperate with said twoA surfaces, a lever member pivotally connected with said driven'member and eccentrically pivoted to said clutch and brake shoe meansfluid voperated means coupled with said levermember to effect radial inward shifting of said clutch and brake pivoted to said clutch and brake shoe means,

uid operated means coupled with said lever member to effect radial inward shifting of said clutch and brake shoe means for engagement with the peripheral surface of said driving member, a spring assembly coupled with said lever member to effect radial outward shifting of the clutch and brake shoe means for engagement with the stationary braking surface when said fluid operated means are inactive, and weighted means arranged on said driven member and adapted to partly counteract centrifugal forces on said clutch and brake shoe means when the driven member of said mechanism is rotating.

3. A clutch and brake mechanism as described facesvandincluding'a bearing' centrally thereof, a a lever arrangement having a shaft pivotally vcoupled with said driven member and an eccentric pivoted inthe bearing of said clutch and brake shoe. means,and actuating means associated with saiddriven member and coupled with said lever-,arrangement for rocking same on saidY shaft' to effect'selective radial inward shifting of said clutch -and '.brakeshoemeans linto clutching engagement with the peripheral surfacey of saiddriving member Vand selective radialfoutward shifting of said clutch and brake shoe means into .braking .engagement with said'stationary member. f l f 6. In aV clutchand brake mechanismv a base member, shiftable frictionV shoev members having inner. and outer friction surfaces, a circular driving member. encircled 4by the innerfriction surfaces of said. friction `shoe members, av second f circular member encircling the outer friction surfaces .of said friction shoe members, operating devices adapted `to shiftsaid friction shoe members to selectively. bring .their friction surfaces into frictional Vcontact with said circularfmembers, and rocking members coupling said operating -devices'with said friction shoe members, said coupling members being Vpivoted to said base member and including eccentricspivotally con nected with said friction shoe members.

7. In clutch and brake mechanism a base member, shiftable friction shoe members having inner and outer friction surfaces, a stationary circular member encircling the outer friction surfaces of said shoe members, a rotary circular member enin claim 2, wherein said weighted means are i coupled with said lever member to partly counteract centrifugal forces on said clutch and brake shoe means proportionate to their distance from the axis of said driven member.

4. In a clutch and brake mechanism a driving member including a peripheral surface, a driven member including a base member centrally thereof, means affording a stationary braking surface, unitary clutch and brake shoe means arranged to selectively cooperate with said two surfaces, a lever member having its central portion pivoted to the base member of said driven member and including eccentric means coupled with said clutch and brake shoe means, iiuid operated means including a cylinder arranged in said base member and a piston linked to one side of said lever member adapted to effect radial inward shifting of said clutch and brake shoe means for engagement with the peripheral surface of said driving member, and a spring assembly pivotally connected to said base member and the other side of said lever member adapted to effect radial outward shifting of said clutch and brake shoe means for engagement with the stationary braking surface when said fluid operated means are inactive.

5. In a clutch and brake mechanism a driving member including a peripheral surface, a driven member, means affording a stationary braking surface arranged adjacent to said driven member, unitary clutch and brake shoe means having laterally spaced clutch and braking members adapted to selectively cooperate with said surcircled by the inner friction surfaces of said shoe members, fluid operated means adapted to shift the friction shoe members to bring their inner friction surfaces into kfrictional contact with the rotary circular member, spring operated means adapted to shift the friction shoe members to bring their outer friction surfaces into frictional contact with the stationary circular member, rocking members pivoted to said base member and coupled with said fluid operated and spring operated means and eccentrics on said rocking members pivotally coupled with said friction shoe members.

8. In clutch and brake mechanism a base member, shiftable friction shoe members having inner and outer friction surfaces, a stationary circular member encircling the outer friction surfaces of said friction shoe members, a rotary circular member encircled by the inner friction surfaces of said friction shoe members, air cylinder members on said base member having pistons adapted to shift the friction shoe members to bring their inner friction surfaces into frictional contact with the rotary circular member, spring operated means on said base vmember adapted to shift the friction shoe members to bring their outer friction ysurfaces into frictional contact with the stationary circular member, rocking members pivoted to said base member and coupled with the pistons of said air cylinder members and the spring operated means, and eccentrics on said rocking members pivotally coupled with said friction shoe members, said eccentrics being arranged to shift said friction shoes inwardlywhen said rocking member is actuated by said air cylinder members and outwardly when said rocking member is actuated by said spring operated'means.

9. In a clutch and brake mechanism for coupling a circular driving member'with a co-axial circular member arranged adjacent to said drive ing member; :aibasef member arranged l.between-.fre t said-circular members :cot-axial'itherewithxshiftei able-frictionrshoe members :havingzfriction por-jg;

means adaptedn to shiftwsaid=` friction shoe c' A members so that the said one frictionportionof tionsextended lateraliyiand in opposites directions;;one of;4 the frictionl portions, ofzeach friction shoe: member, encircling said drivingxmember and-V,y

the other friction .portionbeing encircledeby, saideg:

othervcircular member;x operatingr means .on said, 1 basemember'adaptedeto4 shiftisaid,frictionzrshoe e Y memberstinto frictional;'contact` selectively With saiddriving member` .and said kkcircular member;

andzrrocking ,memberscouplin'g said operating;v idevices:;with 1 said j friction shoe*` :member-s, said` coupling members being pivoted to said .base-1v..r

member and including eccentrica'. pivotallyonnected'withsaid shoe members.":

10. In a'clutchiandvbrakemechanisrn a. circular.v

drivingfmember and a cov-:axial circular stationary i member: arranged.; adjacent fito said ,driving members,laf basemembergishiftable friction shoes h members `each including agbody portion.; radially extended: withV respect'.V torrall sa'idxmembers. and ,v frictionportionsr.extended; laterally from said body` portion `from ,opposite sides thereof, one of r the friction portions ofeachfriction shoe member encircling saiddriving memberand the other one of the said'frictioniportions Kextendingrinto said .'circular,` stationary member,..: air-operatedH v.

11. A clutch and brake mechanism as described z in claim 10, including a single means for coupling'. eachof said friction shoes and Said air operated. and spring operated means, said coupling means: v each embodying a rocking member pivoted to said f basemember and coupied with saidair operated and springvoperated means andan eccentric on said rocking member pivoted to a brake shoev member,

JOI-1N N. WEILAND..

REFERENCES CITED The following `referencesare of record in the file of'tiiis patent:`

Numberacaa Name Date 1,643,473 i Ross Sept. 27, 1927 2,458,664 Weiland Y Jan.r 11, 1949 

